I agree about the trees. They look worse than IV's trees, so I expect that to be fixed long before the game is released. My guess is they first placed the trees, then later they'll go back and work on the graphics of them. And besides, we all know by now many things that appear in the trailers and screens have been known to be largely changed, or not make the final cuts.
Either way, clearly Rockstar has no intentions on releasing this game anytime soon.. or even moderately soon. I think we all hoped that the original trailer release would suggest the game was nearly completed to avoid keeping fans from waiting too long.. It wasnt the case. lol